Device-to-device D2D service transmission method, apparatus, and device

Abstract

A method is provided. The method includes obtaining, by UE, signal quality of a first cell operating on a first transmission carrier frequency. When the UE determines that the signal quality of the first cell is higher than a preset threshold, and the UE receives first indication information sent by the first cell, the method includes selecting, by the UE, the first cell as a serving cell, where the first indication information indicates that the first cell can control the UE to transmit device-to-device D2D service data on a second transmission carrier frequency, and the first transmission carrier frequency and the second transmission carrier frequency are located at different frequencies.

What is claimed is: 
     
       1. A method, comprising:
 measuring signal quality of a first cell of a base station operating on a first transmission carrier frequency; 
 in response to determining that the signal quality of the first cell is higher than a preset threshold, and in response to receiving first indication information of the first cell from the base station, selecting the first cell as a serving cell, wherein the first indication information indicates configuration information of a second transmission carrier frequency for transmitting device-to-device (D2D) service data, and the first transmission carrier frequency and the second transmission carrier frequency are different frequencies; and 
 transmitting the D2D service data to a terminal using the second transmission carrier frequency. 
 
     
     
       2. The method according to  claim 1 , wherein the serving cell supports a D2D service. 
     
     
       3. The method according to  claim 1 , further comprising:
 transmitting synchronization information to the terminal on the second transmission carrier frequency, wherein a coverage identifier of the synchronization information is set to in-coverage. 
 
     
     
       4. The method according to  claim 1 , wherein receiving the first indication information of the first cell from the base station comprises:
 receiving system information broadcast from the base station, wherein the first indication information of the first cell is included in the system information; or 
 receiving radio resource control (RRC) specific control signaling from the base station, wherein the first indication information of the first cell is included in the RRC specific control signaling. 
 
     
     
       5. The method according to  claim 1 , wherein the first indication information of the first cell comprises frequency information of the second transmission carrier frequency. 
     
     
       6. An apparatus, comprising:
 a memory storage comprising instructions; and 
 one or more processors in communication with the memory storage, wherein the execution of the instructions by the one or more processors causes the apparatus to:
 measure signal quality of a first cell of a base station operating on a first transmission carrier frequency; 
 in response to determining that the signal quality of the first cell is higher than a preset threshold, and in response to receiving first indication information of the first cell from the base station, select the first cell as a serving cell, wherein the first indication information indicates configuration information of a second transmission carrier frequency for transmitting device-to-device (D2D) service data, and the first transmission carrier frequency and the second transmission carrier frequency are different frequencies; and 
 transmit the D2D service data to a terminal using the second transmission carrier frequency. 
 
 
     
     
       7. The apparatus according to  claim 6 , wherein the serving cell supports a D2D service. 
     
     
       8. The apparatus according to  claim 6 , wherein the execution of the instructions by the one or more processors further causes the apparatus to:
 transmit synchronization information to the terminal on the second transmission carrier frequency, wherein a coverage identifier of the synchronization information is set to in-coverage. 
 
     
     
       9. The apparatus according to  claim 6 , wherein the execution of the instructions by the one or more processors causes the apparatus to:
 receive system information broadcast from the base station, wherein the first indication information of the first cell is included in the system information; or 
 receive radio resource control (RRC) specific control signaling from the base station, wherein the first indication information of the first cell is included in the RRC specific control signaling. 
 
     
     
       10. The apparatus according to  claim 6 , wherein the first indication information of the first cell comprises frequency information of the second transmission carrier frequency. 
     
     
       11. A method, comprising:
 measuring, by a first terminal, signal quality of a first cell of a base station operating on a first transmission carrier frequency; 
 in response to determining that the signal quality of the first cell is higher than a preset threshold, and in response to receiving first indication information of the first cell from the base station, selecting, by the first terminal, the first cell as a serving cell, wherein the first indication information indicates configuration information of a second transmission carrier frequency for transmitting device-to-device (D2D) service data, and the first transmission carrier frequency and the second transmission carrier frequency are different frequencies; 
 transmitting, by the first terminal, the D2D service data to a second terminal using the second transmission carrier frequency; and 
 receiving, by the second terminal, the D2D service data from the first terminal on the second transmission carrier frequency. 
 
     
     
       12. The method according to  claim 11 , wherein the serving cell supports a D2D service. 
     
     
       13. The method according to  claim 11 , further comprising:
 transmitting, by the first terminal, synchronization information to the second terminal on the second transmission carrier frequency, wherein a coverage identifier of the synchronization information is set to in-coverage. 
 
     
     
       14. The method according to  claim 11 , wherein receiving, by the first terminal, the first indication information of the first cell from the base station comprises:
 receiving, by the first terminal, system information broadcast from the base station, wherein the first indication information of the first cell is included in the system information; or 
 receiving, by the first terminal, radio resource control (RRC) specific control signaling from the base station, wherein the first indication information of the first cell is included in the RRC specific control signaling. 
 
     
     
       15. The method according to  claim 11 , wherein the first indication information of the first cell comprises frequency information of the second transmission carrier frequency. 
     
     
       16. A wireless communication system, comprising:
 a first terminal; and 
 a second terminal; 
 wherein the first terminal is configured to:
 measure signal quality of a first cell of a base station operating on a first transmission carrier frequency; 
 in response to determining that the signal quality of the first cell is higher than a preset threshold, and in response to receiving first indication information of the first cell from the base station, select the first cell as a serving cell, wherein the first indication information indicates configuration information of a second transmission carrier frequency for transmitting device-to-device (D2D) service data, and the first transmission carrier frequency and the second transmission carrier frequency are different frequencies; and 
 transmit the D2D service data to the second terminal using the second transmission carrier frequency; and 
 
 wherein the second terminal is configured to:
 receive the D2D service data from the first terminal on the second transmission carrier frequency. 
 
 
     
     
       17. The system according to  claim 16 , wherein the serving cell supports the D2D service. 
     
     
       18. The system according to  claim 16 , wherein the first terminal is further configured to transmit synchronization information to the second terminal on the second transmission carrier frequency, and a coverage identifier of the synchronization information is set to in-coverage. 
     
     
       19. The system according to  claim 16 , wherein the first terminal is configured to:
 receive system information broadcast from the base station, wherein the first indication information of the first cell is included in the system information; or 
 receive radio resource control (RRC) specific control signaling from the base station, wherein the first indication information of the first cell is included in the RRC specific control signaling. 
 
     
     
       20. The system according to  claim 16 , wherein the first indication information of the first cell comprises frequency information of the second transmission carrier frequency.